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Questions tagged [iotdb]

Apache IoTDB (Database for Internet of Things)

"Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud. Due to its light-weight architecture, high performance and rich feature set together with its deep integration with Apache Hadoop, Spark and Flink, Apache IoTDB can meet the requirements of massive data storage, high-speed data ingestion and complex data analysis in the IoT industrial fields."

Source: https://iotdb.apache.org/

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How to set the path of installing Apache IoTDB through command?

When I compiled source code of IoTDB, I want to set the startup path to the path I created, but seems like I cannot find this path when I install IoTDB. Is there a way to specify the path through command in Apache IoTDB? Does anyone can deal this…
guqing
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Why can't Apache IoTDB return certain number of data in descending order?

The data in Apache IoTDB Version 1.1.0 is updated in real time, and there is no problem with querying in descending order (using "order by time desc" statement). However, I find that after adding "limit 1" after "desc" in query statement, the query…
guqing
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Why did Apache IoTDB Version 1.1.0 reported "too many requests" error when writing data?

When I replaced the "lib" profile of Version 1.1.0 and write data in Apache IoTDB, an error was reported: "StatementExecutionException Create breakpoint: 606: Reject write because there are too many requests need to process". I tried to change the…
user21918578
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Why Apache IoTDB reported "Invalid method name" error after startup?

executeQueryStatement failed: org.apache.iotdb.rpc.IoTDBConnectionException: org.apache.thrift.TApplicationException: Invalid method name: 'executeQueryStatementV2'，1.0版本的 I found an error right after I start up and tried to query using Apache IoTDB…
coco
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How to check the grammar of time series name to avoid reporting "empty set" when querying in Apache IoTDB?

I used the "select * from root.jj.1#_10#.*" statement to query data in Apache IoTDB Version 1.0.0, but it reported an empty set when this time series has data in it. I checked the official website of IoTDB, and it seems like this is a problem…
user21515202
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How to prevent the queue aligned by device from being restricted in Apache IoTDB?

I use Apache IoTDB Version 1.1.0 to try to query more than 500 time series using "align by device" command, and an error appears: "org.apache.iotdb.rpc.StatementExecutionException: 305: cannot fetch schema, status is: 301, msg is: The queue is…
user21515202
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How to unify different fields of different devices into one time series in Apache IoTDB?

Can Apache IoTDB unify different fields of different devices into one time series? The data of our forecasting model comes from data of the measurement point of different devices, and the writing frequency of the devices is different. It is…
coco
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How to check the time corresponding to the maximum value of certain time period in Apache IoTDB?

select extreme(DDS09) from root,22,B78624018 where time >= 1675240584000 and time <= 1675240704000 When I use this following query statement: select extreme(DDS09) from root,22,B78624018 where time >= 1675240584000 and time <= 1675240704000 I…
brook
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How to stop the automatic data/snapshot process of Apache IoTDB?

I am currently using Version 1.0.0 of Apache IoTDB. I found that the size of the "data/snapshot" folder is much larger than that of the "data/sequence" folder. I looked the subfolders of "data/snapshot" and it looks like this is the database…
李袖旗
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How to query the aggregation value of the same measurement point data grouping by time under different devices in Apache IoTDB?

Currently the raw data I stored in Apache IoTDB is like: Time 1, Device 1. Measuring point; Time 1, Device 2. Measuring point; Time 2, Device 1. Measuring point; Time 2, Device 2. Measuring point I want to calculate the aggregated data value of…
Thoreau I
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How to set parameters with no data value in Apache IoTDB to speed up query time using sum?

I just finished setting up Apache IoTDB Version 1.0.1 and I frequently need to use "sum" command to calculate data. I am now using aligned time series, so I want to ask how should I store the parameter in one time series with no data value. Should I…
李袖旗
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Why do the query result according to descending timestamp in Apache IoTDB cannot be returned?

I stored a large amount of data in Apache IoTDB Version 1.0, and I found a problem recently. When I tried to query this massive amount data by ascending timestamp order, I got the corresponding result quickly, but when I tried to query by descending…
harden
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How can Apache IoTDB replicate batch of data and change timestamps?

Now I need a set of historical data in Apache IoTDB to train data models, so I decide to replicate the current stored data and modify the timestamps. I wonder how can IoTDB efficiently replicate large amount of data? Anyone know that? Help please
harden
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How should the error in the root directory cluster settings of Apache IoTDB Version 0.13 be solved?

mvn clean package -pl cluster -am -DskipTests [Error] Could not find the selected project in the reactor: cluster @ I was following the tutorial user guide on cluster settings of Apache IoTDB Version 0.13. When I entered "mvn clean package -pl…
Iustar
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How to simply package the source code of Apache IoTDB into jar package?

Does anyone have experience on how to package the source code of Apache IoTDB into a jar package? I know that direct compilation will be capable, but I cannot find which is the executable jar package in the given document since many are…
user21750676
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